LR97D Electronic Over Current Relay

Basic Info

Product Description

Model NO.: LR97D

Usage: Over-Current Relay

Type: Electric Parameter Relay

Origin: China

Theory: Current Relay

Size: Miniature

Trademark: Vaya or OEM

LR97D Electronic Over Current Relay

Presentation

LR97 D and LT47 electronic over current relays have been developed to satisfy machine protection requirements&period; These relays have definite time characteristics&colon; Current threshold and time based function&period; They are particularly recommended for providing mechanical protection on machines with high resistive torque&comma; highInertia and with strong probability of jamming under steady state conditions&period; They can be used for motor protection in the case of long starting times or frequent starting&period; The LR97 D relay also incorporates two fixed time protection functions&comma; one of 0&period;5 seconds against locked rotor andOne of 3 seconds against phase failure&period; LR97 D and LT47 can be used to provide mechanical shock protection&period; In this case&comma; setting the O-Time knob toMinimum will ensure tripping in 0&period;3 seconds&period;

Applications

LR97 D and LT47 relays are particularly suitable for the following machines&colon;

Monitoring function for excessively long starting time on machines with a risk of difficult starting&colon; Machines with high resistive torque&comma; high inertia machines&period; Monitoring of machines during steady state operation&colon; Overtorque detection functionMachines with strong risk of jamming&comma; machines with torque build-up over time&comma; Mechanical failure monitoring&comma; Faster detection of malfunctioning on machines where the motor is oversized in relation to its thermal protection I² T&period; Motor protection for specific applications&colon; Machines with long starting times&comma; Machines with high on-load factor&colon; More than 30 to 50 starts&sol;hour&comma; Machine with fluctuating load from a steady state&comma; where the thermal image of a thermal overload relay &lpar;thermalMemory&rpar; is unsuitable in relation to actual overheating of the motor&period; Examples of machines&colon; Conveyors&comma; crushers and mixers&comma; Fans&comma; pumps and compressors&comma; Centrifuges and spin-dryers&comma; Presses&comma; shearing machines&comma; saws&comma; broaching machines&comma; sanders and lifting hoists&period;